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    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
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    <script>
      const arr = ["a", "b", "c"];

      console.log("原数组", arr);
      console.log(arr.push("d"));
      console.log(arr.push("e"));
      console.log(arr.push("f", "g", "h"));
      console.log("原数组", arr);

      /*
      const arr = {
       0:'a',
       1:'b',
       2:'c',
      }
      */
    </script>
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